maechidiine, Burmeister, 1855

Prokofiev, Artem M., 2022, New species and records of Maechidius Macleay, 1819 from New Guinea (Coleoptera: Scarabaeidae: Melolonthinae), Zootaxa 5205 (5), pp. 445-462 : 461-462

Emendations to Telnov’s (2020) key to the maechidiine species from the Indo-Australian transitional zone and Bali

4. Elytra without tracks of longitudinal carinae; intervening spaces of elytra not transversely wrinkled................................................................................................ M. paralellicollis Moser, 1920

– Elytra with vague tracks of longitudinal carinae; intervening spaces of elytra transversely wrinkled................... 4A

4A. Punctures of head and pronotum ovoid, with fur-like micropubescence; about 16 denticles along lateral sides of pronotum....................................................................... M. astrolabius Prokofiev , new species

– Punctures of head and pronotum annular, lacking micropubescence; 19–25 crenulae along lateral sides of pronotum..... 4B

4B. 19–20 crenulae along lateral sides of pronotum........................................ M. humeralis Heller, 1914

– 24–25 crenulae along lateral sides of pronotum............................. M. acutus ( Narakusumo & Balke, 2019)

***

9. Hypomeron separated from prosternum by low straight carina................................................ 9A

– Hypomeron almost fused to prosternum............................................... M. rugicollis Moser, 1920

9A. Aedeagus as on Figs. 5C–D................................................ M . echinoides Prokofiev, new species

– Aedeagus as in Telnov (2020: figs. 614–616)............................................... M. esau Heller, 1914

***

12. Underside of male’s basal metatarsomere with a long setae which are not brush-like arranged and rather suberect; aedeagus as in Telnov (2020: 709 – 711)........................................................... M. similis Telnov, 2020

– Underside or margins of male’s basal metatarsomere with a brush of long (sub)erect setae.......................... 13

13. Abdominal ventrites medially with golden (sub)erect setae; intervening spaces of elytra densely microreticulate............................................................................................ M. tarsalis Arrow, 1941

– Abdominal ventrites without golden (sub)erect setae (small and poorly delimited patches of thickened setae can present medially on anteriormost two abdominal ventrites, then intervening spaces of elytra glossy).............................. 13A

13A. Elytra without longitudinal carinae; intervening spaces of elytra distinctly microreticulate, forming a silky appearance; aedeagus as on Figs. 7D–E....................................................... M . macrosoma Prokofiev, new species

– Elytra with more or less expressed longitudinal carinae; intervening spaces of elytra glossy to wrinkled in part, not silky in appearance....................................................................................... 13B

13B. Somewhat enlarged setae in irregular longitudinal rows on elytra; ventrolateral margins of male’s first metatarsomere with a brush of very long setae (nearly as long as tarsomere) ( Fig. 8A ); aedeagus as in Telnov (2020: 620–622)................................................................................................. M. hirtipes Arrow, 1941

– No enlarged setae in longitudinal row on elytra; ventrolateral margins of male’s first to third metatarsomeres with a brush of long setae (but distinctly shorter than the length of tarsomere) ( Fig. 9D ); aedeagus of different shape................. 13C

13С. Longitudinal carinae on elytral disc incomplete, not extending past mid-length of elytron ( Fig. 8B ); no medial tubercles or patches of setae on anteriormost two abdominal ventrites; aedeagus as in Telnov (2020: 724–725)................................................................................................... M. subcostatus Heller, 1895

– Longitudinal carinae on elytra complete; small patches of stiffened yellowish setae on weak protuberance medially on anteriormost two abdominal ventrites ( Fig. 9B ); aedeagus as in Figs. 9E–F......... M . penicilliger Prokofiev, new species

***

15. Body with solid coating of microscopical velvety pubescence; tips of parameres crossing each other........................................................................................... M. addarcis Prokofiev , new species

– No solid coating of microscopical velvety pubescence on body; tips of parameres not crossing each other ….......... 15A

15A. See couplet 15 in Telnov (2020).

***

20. Parameres slender, narrowed toward apex................................................................ 21

– Parameres broad................................................................................... 20A

20A. Elytral puncturation not forming the irregularly paired rows of punctures; aedeagus as in Figs. 3C–D........................................................................................ M . bombycinus Prokofiev, new species

– Elytral puncturation forming the irregularly paired rows of punctures; aedeagus as in Telnov (2020: figs. 679–680).................................................................................. M. nepenthephilus Telnov, 2020

***

56. Species from Sulawesi ................................................................................ 57

– Species from New Guinea............................................................................ 56A

56A. Body matt; abdomen strongly concave in profile; protibial spur absent in male ( Fig. 11C ); aedeagus as in Figs. 11D–E ............................................................................ .. M. telnovi Prokofiev , new species

– Body glossy; abdomen almost straight in profile; protibial spur present in male ( Fig. 12C ); aedeagus as in Telnov (2020: figs. 673–675)........................................................................ M. muticus Arrow, 1941

Figures

FIGURE 3. Holotype of Maechidius bombycinus Prokofiev, new species. (A) dorsal view; (B) protibia; (C) aedeagus, lateral view; (D) parameres, dorsal view; (E) spiculum gastrale, dorsal view; (F) ditto, lateral view. Scale bars: (A, B) 1.0 mm; (C–F) 0.5 mm.

FIGURE 5. Maechidius echinoides Prokofiev, new species. (A) dorsal view, holotype; (B) protibia, holotype; (C) aedeagus, lateral view, holotype; (D) parameres, dorsal view, holotype; (E) spiculum gastrale, lateral view, holotype; (F) ditto, dorsal view; (G) protibia, female paratype. Scale bars: (A) 1.5 mm; (B, G) 1.0 mm; (C–F) 0.5 mm.

FIGURE 7. Holotype of Maechidius macrosoma Prokofiev, new species. (A) dorsal view; (B) protibia; (C) hind tarsi, lateral view; (D) aedeagus, lateral view; (E) parameres, dorsal view; (F) spiculum gastrale, dorsal view; (G) ditto, dorsolateral view. Scale bars: (A) 2.0 mm; (B, D–G) 1.0 mm; (C) 0.5 mm.

FIGURE 8. Maechidius hirtipes Arrow, 1941, lectotype (A) and M. subcostatus Heller, 1895, lectotype (B), dorsal view. Not in scale.

FIGURE 9. Holotype of Maechidius penicilliger Prokofiev, new species. (A) dorsal view; (B) first three abdominal ventrites, ventral view (medial protuberances arrowed); (C) protibia; (D) hind tarsi, lateral view; (E) aedeagus, lateral view; (F) parameres, dorsal view; (G) spiculum gastrale, dorsal view; (H) ditto, lateral view. Scale bars: (A, C, D) 1.0 mm; (B, E–H) 0.5 mm.

FIGURE 11. Holotype of Maechidius telnovi Prokofiev, new species. (A) dorsal view; (B) lateral view; (C) protibia; (D) aedeagus, lateral view; (E) parameres, dorsal view; (F) spiculum gastrale, dorsal view. Scale bars: (A–C) 1.0 mm; (D–F) 0.5 mm.

FIGURE 12. Male syntype of Maechidius muticus Arrow, 1941. (A) dorsal view; (B) lateral view; (C) protibia. Not in scale.